Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Boston/Norton, MA

August 5, 2012Franklin County, Hampden County, Hampshire County, Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 2012, 8:08 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts; Capitol Planning Region, Connecticut. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 5, 2012, 8:08 PM EDT (00:08 UTC)
Expired
Aug 5, 2012, 8:49 PM EDT
In force
41 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Capitol Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 99 km from the middle of the area, began a volume at 00:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.1 hours before the alert went out and 88 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2012-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1547 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2012-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1547 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
888 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

202 
WUUS51 KBOX 060008
SVRBOX
CTC003-MAC011-013-015-060100-
/O.NEW.KBOX.SV.W.0077.120806T0008Z-120806T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
808 PM EDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF HARTLAND...
  CENTRAL FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...
  WESTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
  WESTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF NORTHAMPTON...

* UNTIL 900 PM EDT

* AT 804 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM MIDDLEFIELD AND TOLLAND TO HARTLAND CONNECTICUT...AND WAS 
  MOVING NORTHEAST AT 40 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...CHESTER...BLANDFORD...EAST
  WINDSOR...WORTHINGTON...HUNTINGTON...CUMMINGTON...CHESTERFIELD...
  RUSSELL...GOSHEN...GRANVILLE...WESTHAMPTON...MONTGOMERY...
  ASHFIELD...WILLIAMSBURG...SOUTHAMPTON...WESTFIELD...CONWAY...
  EASTHAMPTON...SHELBURNE...WHATELY...HATFIELD...SUNDERLAND...
  DEERFIELD...HADLEY...HOLYOKE...MONTAGUE AND LEVERETT.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL
AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...
INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER
TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.

&&

LAT...LON 4214 7308 4216 7303 4230 7301 4233 7307
      4239 7307 4239 7302 4248 7299 4269 7256
      4244 7249 4220 7261 4196 7303 4198 7303
      4203 7302 4204 7306 4211 7308
TIME...MOT...LOC 0005Z 235DEG 34KT 4235 7314 4215 7308
          4191 7319

$$

WTB
1 follow-up statement
174 
WWUS51 KBOX 060049
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
849 PM EDT SUN AUG 5 2012

CTC003-MAC011-013-015-060058-
/O.CAN.KBOX.SV.W.0077.000000T0000Z-120806T0100Z/
HARTFORD CT-FRANKLIN MA-HAMPSHIRE MA-HAMPDEN MA-
849 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN HAMPDEN...WESTERN
HAMPSHIRE...CENTRAL FRANKLIN AND EXTREME NORTHWESTERN HARTFORD
COUNTIES IS CANCELLED...

THUNDERSTORMS WEAKENED AS THEY MOVED INTO THE CONNECTICUT VALLEY.  
THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 4214 7308 4216 7303 4230 7301 4233 7307
      4239 7307 4239 7302 4248 7299 4269 7256
      4244 7249 4220 7261 4196 7303 4198 7303
      4203 7302 4204 7306 4211 7308
TIME...MOT...LOC 0048Z 235DEG 34KT 4258 7269 4238 7263
          4214 7274

$$

WTB

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 5, 8:18 PM EDTAreal Flood AdvisoryBOXHampden, Hampshire117 min
Aug 6, 12:24 AM EDTSmall Craft AdvisoryBOX7 hr
Aug 6, 7:11 AM EDTSmall Craft Advisory for Hazardous SeasBOX9 hr
Aug 5, 8:13 PM EDTSpecial Weather StatementBOX62 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012Severe Thunderstorm Warnings in Connecticut, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.